increate GC orphan test timeout

test/e2e/apimachinery/garbage_collector.go

@@ -297,9 +297,10 @@ var _ = SIGDescribe("Garbage collector", func() {
 		// a client is 5. If the qps is saturated, it will take 20s to orphan
 		// the pods. However, apiserver takes hundreds of ms to finish one
 		// PATCH, and the gc sends the patching in a single thread, so the
-		// actual qps is less than 5. According to the test logs, 60s is enough
-		// time.
-		if err := wait.Poll(5*time.Second, 60*time.Second, func() (bool, error) {
+		// actual qps is less than 5. Also, the e2e tests are running in
+		// parallel, the GC controller might get distracted by other tests.
+		// According to the test logs, 120s is enough time.
+		if err := wait.Poll(5*time.Second, 120*time.Second, func() (bool, error) {
 			rcs, err := rcClient.List(metav1.ListOptions{})
 			if err != nil {
 				return false, fmt.Errorf("Failed to list rcs: %v", err)